Well… Thank you for replying, Susan. However, it’s 10 days already. And I believe if you are customer, you don’t want to wait 10 days to get answer. I did resolve issue myself.

For others if you face to the same trouble, please pay attention that Genesis 2.0 is using font-size: 14px as 100%, instead of 16px, likes in Genesis 1.x. So, for using rem, you will need to divide to 14, not 16.